<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html> <head><meta charset="utf-16le"> </head> <body></body> </html> <title>HSN Entry</title> <link href="hsn.css" media="screen" rel="stylesheet" /><!--need to insert stylesheet link for print version here--><!--need to insert code for old browsers here--> <div id="header"><img align="left" height="85" src="images/logo.gif" /> <h1>horological science</h1> <h2>current and recent issues</h2> </div> <div id="menu"> <ul> <li><a href="http://www.hsn161.com/HSN/hsn_entry.html">home</a></li> <li><a href="http://www.hsn161.com/HSN/161intro.html">chapter 161</a></li> <li><a href="http://www.hsn161.com/HSN/newsletter.html">newsletter</a></li> <li><a href="http://www.hsn161.com/HSN/literature.html">literature</a></li> <li><a href="http://www.hsn161.com/BHM/bhm1-allusers/bhm_entry.php">bibliographia horologiae mundi</a></li> <li><a href="http://www.hsn161.com/HSN/science.html">pendulum science</a></li> <li><a href="http://www.hsn161.com/HSN/topics.html">horological topics</a></li> <li><a href="http://www.hsn161.com/HSN/credits.html">site credits</a></li> <li><a href="http://www.hsn161.com/HSN/links.html">links</a></li> <li><a href="http://www.hsn161.com/HSN_Admin/hsn_member_home.php">hsn admin</a></li> </ul> </div> <div id="content"> <h2></h2> <h2></h2> <h2>HOROLOGICAL SCIENCE NEWSLETTER - NAWCC CHAPTER #161<br /> Issue 2022-2 April 2022</h2> <h2>HOROLOGICAL SCIENCE NEWSLETTER - NAWCC CHAPTER #161<br /> Issue 2022-1 January 2022</h2> <h2>HOROLOGICAL SCIENCE NEWSLETTER - NAWCC CHAPTER #161<br /> Issue 2021-5 December 2021</h2> r&gt; <table> <tbody> <tr> <td>2 - 26</td> <td>The Robertson Regulator by John Haine</td> </tr> <tr> <td>17 - 21</td> <td>Looking to confirm with old published experimental data a novel model of Harrison&rsquo;s Cheeks-and-Ribbon pendulum suspension by Andrea De Marchi</td> </tr> <tr> <td>22 -27</td> <td>Spectral Analysis of Pendulum clocks (Tides, part 6) by Tom Van Baak</td> </tr> <tr> <td>28</td> <td>Time to renew</td> </tr> </tbody> </table> <div id="content"> <h2>HOROLOGICAL SCIENCE NEWSLETTER - NAWCC CHAPTER #161<br /> Issue 2021-4 September 2021</h2> <table> <tbody> <tr> <td>2 - 7</td> <td>Harrison&#39;s Cheeks&amp;Ribbon pendulum suspension greatly differs from a flexure-spring by Andrea De Marchi</td> </tr> <tr> <td>8 - 24</td> <td>Escapement modeling with Working Model 2D by Bob Holmstr&ouml;m</td> </tr> <tr> <td>24</td> <td>The HSN and BHM website is moving!</td> </tr> </tbody> </table> <h2>HOROLOGICAL SCIENCE NEWSLETTER - NAWCC CHAPTER #161<br /> Issue 2021-3 June 2021</h2> <table> <tbody> <tr> <td>2 - 16</td> <td>How good is Airy? by Andrew Millington</td> </tr> <tr> <td>17 - 46</td> <td>A New Method for Modelling Escapement Action by Systems Engineering Techniques by J.B. Edwards</td> </tr> </tbody> </table> <h2>HOROLOGICAL SCIENCE NEWSLETTER - NAWCC CHAPTER #161<br /> Issue 2021-2 April 2021</h2> <table> <tbody> <tr> <td>2 - 4</td> <td>Is there an optimum pendulum amplitude? by John Haine</td> </tr> <tr> <td>5 - 22</td> <td>State-Transition Modelling of the Grasshopper Escapement by J. B. Edwards</td> </tr> <tr> <td>23-26</td> <td>How precise are opto-interrupters? By John Haine</td> </tr> <tr> <td>27</td> <td>A Modern Version of Warren&rsquo;s Master Clock by A. Prasil</td> </tr> </tbody> </table> <h2>HOROLOGICAL SCIENCE NEWSLETTER - NAWCC CHAPTER #161<br /> Issue 2021-1 February 2021</h2> <table> <tbody> <tr> <td>2 - 22</td> <td>Clock B &ndash; Amplitude Response to Changing Pressure and Temperature by Andrew Millington and John Haine</td> </tr> <tr> <td>23 - 25</td> <td>Douglas Bateman&#39;s &quot;Timekeeping: a Lifetime&#39;s Interest in Horology&quot; a Review by Tom Van Baak</td> </tr> <tr> <td>26</td> <td>Response to Thomas Frank about Feral Clocks by Richard Lamoureux</td> </tr> <tr> <td>27</td> <td>Duncan Agnew &ndash; Data for: Tidal Gravity Variations Measured by a Fedchenko AChF-3 Precise Pendulum Clock</td> </tr> </tbody> </table> <h2>HOROLOGICAL SCIENCE NEWSLETTER - NAWCC CHAPTER #161<br /> Issue 2020-5 November 2020</h2> <table> <tbody> <tr> <td>2 - 10</td> <td>Measuring and Analysing a new Clock &ndash; Part 1 by John Haine</td> </tr> <tr> <td>11 - 14</td> <td>Domesticating a feral clock, part1 by Thomas Frank</td> </tr> <tr> <td>15 - 34</td> <td>Airy (et al) v. State-Transition Approaches to Escapement Modeling: An Attempt at Reconciliation by J.B. Edwards</td> </tr> <tr> <td>35</td> <td>Renewal reminder</td> </tr> </tbody> </table> <h2>HOROLOGICAL SCIENCE NEWSLETTER - NAWCC CHAPTER #161<br /> Issue 2020-4 September 2020</h2> <table> <tbody> <tr> <td>1</td> <td>Correction to &ldquo;The Tangent Rule in Practice&rdquo; by Pepi Cima</td> </tr> <tr> <td>2 - 11</td> <td>Just How Good was Fedchenko&rsquo;s Clock? by Duncan Agnew</td> </tr> <tr> <td>12 - 29</td> <td>Recoil Escapement Modelling by State-Transition by J.B. Edwards</td> </tr> <tr> <td>30 - 31</td> <td>Postscript by J.B. Edwards</td> </tr> <tr> <td>32</td> <td>Bob Mathys &ndash; Obituary by Tracy Christenson</td> </tr> </tbody> </table> <h2>HOROLOGICAL SCIENCE NEWSLETTER - NAWCC CHAPTER #161<br /> Issue 2020-3 July 2020</h2> <table> <tbody> <tr> <th>Pages</th> <th>Contents</th> </tr> <tr> <td>2 - 13</td> <td>Contact microphone devices for mechanical watches by S. R. Thackery</td> </tr> <tr> <td>14 - 28</td> <td>Continued Examination of the Tangent Rule and its Development for Rectangular Escapement Pulses by John Edwards</td> </tr> <tr> <td>29 - 30</td> <td>Comments on JB Edwards paper on mathematical modelling by Douglas Bateman</td> </tr> <tr> <td>31</td> <td>An Unusual Pendulum and a Plea for Help by Price Russ</td> </tr> <tr> <td>32</td> <td>Harrison Decoded by Bob Holmstr&ouml;m + note from John Edwards</td> </tr> </tbody> </table> <h2>HOROLOGICAL SCIENCE NEWSLETTER - NAWCC CHAPTER #161<br /> Issue 2020-2 May 2020</h2> <table> <tbody> <tr> <th>Pages</th> <th>Contents</th> </tr> <tr> <td>2 - 20</td> <td>Nonlinearity as an essential component in the Modelling of the Assisted Pendulum by J. B. Edwards</td> </tr> <tr> <td>21 - 24</td> <td>The Tangent Rule in Practice by Pepi Cima</td> </tr> </tbody> </table> <h2>HOROLOGICAL SCIENCE NEWSLETTER - NAWCC CHAPTER #161<br /> Issue 2020-1 February 2020</h2> <table> <tbody> <tr> <th>Pages</th> <th>Contents</th> </tr> <tr> <td>2 - 7</td> <td>Further Historical Performance of Precision Pendulum Clocks by M. K. Hobden</td> </tr> <tr> <td>8 - 21</td> <td>Verge &amp; Foliot Escapement Experiments by Bob Holmstr&ouml;m</td> </tr> <tr> <td>22 - 24</td> <td>An Electrical Engineer Looks at a Watch &ndash; Brief Notes on a Lecture by Prof. Gerald Sussman by David MacMillan</td> </tr> </tbody> </table> <h2>HOROLOGICAL SCIENCE NEWSLETTER - NAWCC CHAPTER #161<br /> Issue 2019-5 December 2019</h2> <table> <tbody> <tr> <th>Pages</th> <th>Contents</th> </tr> <tr> <td>2 - 9</td> <td>A Note on Precision Pendulum Clocks and Allan Deviation by M. K. Hobden</td> </tr> <tr> <td>10 - 32</td> <td>State-Transition Models for Simulating Nonlinear Horological and Related Systems: Two Case Studies by J. B. Edwards</td> </tr> </tbody> </table> <h2>HOROLOGICAL SCIENCE NEWSLETTER - NAWCC CHAPTER #161<br /> Issue 2019-4 October 2019</h2> <table> <tbody> <tr> <th>Pages</th> <th>Contents</th> </tr> <tr> <td>2 - 12</td> <td>Graham White&rsquo;s Epicyclic Trilogy Introduction</td> </tr> <tr> <td>13 - 25</td> <td>Electrically Reset Gravity Escapement Clock by Ian Richardson</td> </tr> <tr> <td>26 - 32</td> <td>A Polish Precision Clock by Bob Holmstr&ouml;m</td> </tr> </tbody> </table> <h2>HOROLOGICAL SCIENCE NEWSLETTER - NAWCC CHAPTER #161<br /> Issue 2019-2 &amp; 3 August 2019</h2> <table> <tbody> <tr> <th>Pages</th> <th>Contents</th> </tr> <tr> <td>2</td> <td>Foreword to three papers on &lsquo;A Role for the Computer in Horological Science&rsquo; J. B. Edwards</td> </tr> <tr> <td>3 - 24</td> <td>#1 - A Role for the Computer in Horological Science? A Case Study in Escapement Theory by J. B Edwards</td> </tr> <tr> <td>25 - 42</td> <td>#2 - A Role for the Computer in Horological Science? A Case Study in Escapement Theory: Amplitude Considerations by J. B. Edwards</td> </tr> <tr> <td>43 - 53</td> <td>#3 - A Role for the Computer in Horological Science? A Digest of a Case Study in Escapement Theory by J.B. Edwards</td> </tr> <tr> <td>54 - 55</td> <td>Appendix 1: State- &amp; Driving- Transition Matrix Elements by J. B. Edwards</td> </tr> <tr> <td>46 - 58</td> <td>Appendix 2: Improved Euler Approximation for State-Transition Coefficient determination by J.B. Edwards</td> </tr> </tbody> </table> <h2>HOROLOGICAL SCIENCE NEWSLETTER - NAWCC CHAPTER #161<br /> Issue 2019-1 May 2019</h2> <table> <tbody> <tr> <th>Pages</th> <th>Contents</th> </tr> <tr> <td>2</td> <td>The state of HSN by Bob Holmstr&ouml;m</td> </tr> <tr> <td>3 - 6</td> <td>A visit to Father O&rsquo;Leary&rsquo;s Clock by Bob Holmstr&ouml;m</td> </tr> <tr> <td>7 - 27</td> <td>Father O&rsquo;Leary&rsquo;s Free Pendulum Revised Set Up Instructions by Pierre Boucheron 1991 &amp; 1994</td> </tr> <tr> <td>28 - 32</td> <td>Multi-variant Regression Analysis of Horological Data using R by Bob Holmstr&ouml;m</td> </tr> </tbody> </table> <h2>HOROLOGICAL SCIENCE NEWSLETTER - NAWCC CHAPTER #161<br /> Issue 2018-5 December 2018</h2> <table> <tbody> <tr> <th>Pages</th> <th>Contents</th> </tr> <tr> <td>2 - 10</td> <td>Another Look at the SH41 Data by Duncan Carr Agnew</td> </tr> <tr> <td>11 - 13</td> <td>Masters, Servants, Countwheels, and a new Artificial Clockmaker by Duncan Carr Agnew</td> </tr> <tr> <td>14 - 27</td> <td>A Pendulum Powered by The Earth&rsquo;s Centrifugal Force Part I: Theory by C. Stuart Kelley</td> </tr> <tr> <td>28</td> <td>Please note that subscriptions for 2019 are now due by David Spong</td> </tr> </tbody> </table> <h2>HOROLOGICAL SCIENCE NEWSLETTER - NAWCC CHAPTER #161<br /> Issue 2018-4 September 2018</h2> <table> <tbody> <tr> <th>Pages</th> <th>Contents</th> </tr> <tr> <td>2 - 10</td> <td>Clock Hydrodynamics&ndash;Part II: Determination of the model constants and comments on Clock B by Douglas S. Drumheller</td> </tr> <tr> <td>11 - 12</td> <td>Clock XI0 by Douglas S. Drumheller</td> </tr> <tr> <td>13 - 26</td> <td>Pendulum and sensor experiments &ndash; A work in progress by Bob Holmstr&ouml;m</td> </tr> <tr> <td>28</td> <td>Please note that subscriptions for 2019 are now due by David Spong</td> </tr> </tbody> </table> <h2>HOROLOGICAL SCIENCE NEWSLETTER - NAWCC CHAPTER #161<br /> Issue 2018-3 July 2018</h2> <table> <tbody> <tr> <th>Pages</th> <th>Contents</th> </tr> <tr> <td>2 - 12</td> <td>Clock Hydrodynamics&ndash;Part I: My Two Clocks &amp; John Harrison&rsquo;s Tin Whistle by Douglas S. Drumheller</td> </tr> <tr> <td>13 - 18</td> <td>On Compound Pendulums Suspended From Circular Chops by John Haine and Andrew Millington</td> </tr> <tr> <td>19 - 21</td> <td>Involute gearing by Henry Casson</td> </tr> <tr> <td>22</td> <td>Comments from the editor</td> </tr> </tbody> </table> <h2>HOROLOGICAL SCIENCE NEWSLETTER - NAWCC CHAPTER #161<br /> Issue 2018-2 April 2018</h2> <table> <tbody> <tr> <th>Pages</th> <th>Contents</th> </tr> <tr> <td>2 - 43</td> <td>Theory of the Verge &amp; Foliot Clock of the Early Medieval Age By Dieter Roess</td> </tr> <tr> <td>44</td> <td>Dieter Roess Biography</td> </tr> </tbody> </table> <h2>HOROLOGICAL SCIENCE NEWSLETTER - NAWCC CHAPTER #161<br /> Issue 2018-1 March 2018</h2> <table> <tbody> <tr> <th>Pages</th> <th>Contents</th> </tr> <tr> <td>2 - 5</td> <td>Mathematics of a Coaxial Watch Escapement, An Introduction for Horological Science Newsletter by Dr. Eng. Gianni Petrangeli</td> </tr> <tr> <td>6 - 8</td> <td>Philip Woodward Obituary</td> </tr> <tr> <td>9</td> <td>Graham White Obituary</td> </tr> <tr> <td>10 - 11</td> <td>Graham White book project</td> </tr> <tr> <td>12</td> <td>New books Betts - Marine Chronometers - Frumer - Making Time</td> </tr> </tbody> </table> </div> <div id="footer"> <h3>bob holmstr&ouml;m - www.hsn161.com</h3> </div> </div>